<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>localstorage</title>
</head>
<body>
    <h2>localStorage</h2>
	<button onclick="saveData()">点我保存一个数据</button>
	<button onclick="readData()">点我读取一个数据</button>
	<button onclick="deleteData()">点我删除一个数据</button>
	<button onclick="deleteAllData()">点我清空一个数据</button>

	<script type="text/javascript">
		let p = { name: '张三', age: 18 }

		function saveData() {
			localStorage.setItem('msg', 'hello!!!')
			localStorage.setItem('msg2', 666)
			localStorage.setItem('person', JSON.stringify(p))
		}
                
		function readData() {
			console.log(localStorage.getItem('msg'))
			console.log(localStorage.getItem('msg2'))
			const result = localStorage.getItem('person')
			console.log(JSON.parse(result))
			console.log(localStorage.getItem('msg3'))
		}
                
		function deleteData() {
			localStorage.removeItem('msg2')
		}
                
		function deleteAllData() {
			localStorage.clear()
		}
	</script>
</body>
</html>